move favicon download code from chrome/ into content/

chrome/browser/prerender/prerender_manager.cc

Index: chrome/browser/prerender/prerender_manager.cc
diff --git a/chrome/browser/prerender/prerender_manager.cc b/chrome/browser/prerender/prerender_manager.cc
index a47b388ab6240ec4a004b52497c9c7ce27b2f450..d5bf8c2a2ed9dd95eb34fff4b4527939cbc4c14d 100644
--- a/chrome/browser/prerender/prerender_manager.cc
+++ b/chrome/browser/prerender/prerender_manager.cc
@@ -439,10 +439,10 @@ bool PrerenderManager::MaybeUsePrerenderedPage(WebContents* web_contents,
 
   GURL icon_url = prerender_contents->icon_url();
   if (!icon_url.is_empty()) {
-    std::vector<FaviconURL> urls;
-    urls.push_back(FaviconURL(icon_url, FaviconURL::FAVICON));
+    std::vector<content::FaviconURL> urls;
+    urls.push_back(content::FaviconURL(icon_url, content::FaviconURL::FAVICON));
     FaviconTabHelper::FromWebContents(new_tab_contents->web_contents())->
-        OnUpdateFaviconURL(prerender_contents->page_id(), urls);
+        UpdateFaviconURL(prerender_contents->page_id(), urls);
   }
 
   // Update PPLT metrics: